i.e. that the systems do not have redundant inputs. However, we want
to emphasize that we do not require \(\operatorname{rank}(\partial _{x}f)=n\) . As
mentioned in [1]}, this property is always
met by systems which stem from the exact or approximate discretization
of continuous-time systems. However, we want to consider discrete-time
systems in general, no matter whether they stem from a discretization
or not.
